The PLC extension is attached to images that represent the top silkscreen of an electronic board, most likely processed via Eagle software. PLC is part of the Gerber group of extensions, which functions as a de facto standard for storing images in the printed circuit board (PCB) industry. Other extensions included in this group are STC, STS and PLS. Each format contains data on a different segment or detail of an electronic board, including solder masks, copper layers etc.
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